You will get more response (I think) if you post the contests as individual topics in this forum in the week leading up to the contest.

It was just an information. I just wanted that readers of this forum know that there is not only a contest each month but a contest each week on the italian site.
I already open a thread on french forum http://sudokuvariante.forumactif.com/ and I try to post on my blog about each sudoku competition. So, I don't want to spend my life announcing tournaments on every forums